After consuming an Enchanted Golden Apple "Notch Apple", you are given certain potion effects which are obviously much stronger than normal golden apples. However, if you consume a normal golden apple after you recently ate an Enchanted Golden Apple, instead of giving the effects of a normal golden apple, you recieve an extension on the Absorption IV from the "notch apple", plus the regen if consumed quickly enough. While this seems intended due to the way potions work, I do not know if this is supposed to be how Enchanted Golden Apples work.

NOTE: This bug was seen on a server minigame (EggWars on CubeCraft - play.cubecraft.net). I have not tested this bug in vanilla Minecraft SSP/SMP.